Revert r72192. It was causing a build failure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72193 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 763 insertions, 746 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index ad7184dd68..086a8a5f60 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -275,9 +275,9 @@ void DwarfDebug::AssignAbbrevNumber(DIEAbbrev &Abbrev) {
   }
 }
 
-/// CreateDIEEntry - Creates a new DIEEntry to be a proxy for a debug
-/// information entry.
-DIEEntry *DwarfDebug::CreateDIEEntry(DIE *Entry) {
+/// NewDIEEntry - Creates a new DIEEntry to be a proxy for a debug information
+/// entry.
+DIEEntry *DwarfDebug::NewDIEEntry(DIE *Entry) {
   DIEEntry *Value;
 
   if (Entry) {
@@ -545,7 +545,7 @@ void DwarfDebug::AddType(CompileUnit *DW_Unit, DIE *Entity, DIType Ty) {
   }
 
   // Set up proxy.
-  Slot = CreateDIEEntry();
+  Slot = NewDIEEntry();
 
   // Construct type.
   DIE Buffer(dwarf::DW_TAG_base_type);
@@ -925,9 +925,9 @@ CompileUnit &DwarfDebug::FindCompileUnit(DICompileUnit Unit) const {
   return *I->second;
 }
 
-/// CreateDbgScopeVariable - Create a new scope variable.
+/// NewDbgScopeVariable - Create a new scope variable.
 ///
-DIE *DwarfDebug::CreateDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit) {
+DIE *DwarfDebug::NewDbgScopeVariable(DbgVariable *DV, CompileUnit *Unit) {
   // Get the descriptor.
   const DIVariable &VD = DV->getVariable();
 
@@ -1012,7 +1012,7 @@ void DwarfDebug::ConstructDbgScope(DbgScope *ParentScope,
   // Add variables to scope.
   SmallVector<DbgVariable *, 8> &Variables = ParentScope->getVariables();
   for (unsigned i = 0, N = Variables.size(); i < N; ++i) {
-    DIE *VariableDie = CreateDbgScopeVariable(Variables[i], Unit);
+    DIE *VariableDie = NewDbgScopeVariable(Variables[i], Unit);
     if (VariableDie) ParentDie->AddChild(VariableDie);
   }
 
@@ -1092,8 +1092,7 @@ void DwarfDebug::ConstructDbgScope(DbgScope *ParentScope,
 
 /// ConstructFunctionDbgScope - Construct the scope for the subprogram.
 ///
-void DwarfDebug::ConstructFunctionDbgScope(DbgScope *RootScope,
-                                           bool AbstractScope) {
+void DwarfDebug::ConstructFunctionDbgScope(DbgScope *RootScope) {
   // Exit if there is no root scope.
   if (!RootScope) return;
   DIDescriptor Desc = RootScope->getDesc();
@@ -1112,19 +1111,43 @@ void DwarfDebug::ConstructFunctionDbgScope(DbgScope *RootScope,
   DIE *SPDie = Unit->getDieMapSlotFor(SPD.getGV());
   assert(SPDie && "Missing subprogram descriptor");
 
-  if (!AbstractScope) {
-    // Add the function bounds.
-    AddLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
-             DWLabel("func_begin", SubprogramCount));
-    AddLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
-             DWLabel("func_end", SubprogramCount));
-    MachineLocation Location(RI->getFrameRegister(*MF));
-    AddAddress(SPDie, dwarf::DW_AT_frame_base, Location);
-  }
+  // Add the function bounds.
+  AddLabel(SPDie, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
+           DWLabel("func_begin", SubprogramCount));
+  AddLabel(SPDie, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
+           DWLabel("func_end", SubprogramCount));
+  MachineLocation Location(RI->getFrameRegister(*MF));
+  AddAddress(SPDie, dwarf::DW_AT_frame_base, Location);
 
   ConstructDbgScope(RootScope, 0, 0, SPDie, Unit);
 }
 
+/// ConstructFunctionDbgScope - Construct the scope for the abstract debug
+/// scope.
+///
+void DwarfDebug::ConstructAbstractDbgScope(DbgScope *AbsScope) {
+  // Exit if there is no root scope.
+  if (!AbsScope) return;
+
+  DIDescriptor Desc = AbsScope->getDesc();
+  if (Desc.isNull())
+    return;
+
+  // Get the subprogram debug information entry.
+  DISubprogram SPD(Desc.getGV());
+
+  // Get the compile unit context.
+  CompileUnit *Unit = MainCU;
+  if (!Unit)
+    Unit = &FindCompileUnit(SPD.getCompileUnit());
+
+  // Get the subprogram die.
+  DIE *SPDie = Unit->getDieMapSlotFor(SPD.getGV());
+  assert(SPDie && "Missing subprogram descriptor");
+
+  ConstructDbgScope(AbsScope, 0, 0, SPDie, Unit);
+}
+
 /// ConstructDefaultDbgScope - Construct a default scope for the subprogram.
 ///
 void DwarfDebug::ConstructDefaultDbgScope(MachineFunction *MF) {
@@ -1173,6 +1196,726 @@ void DwarfDebug::ConstructDefaultDbgScope(MachineFunction *MF) {
 #endif
 }
 
+/// EmitInitial - Emit initial Dwarf declarations.  This is necessary for cc
+/// tools to recognize the object file contains Dwarf information.
+void DwarfDebug::EmitInitial() {
+  // Check to see if we already emitted intial headers.
+  if (didInitial) return;
+  didInitial = true;
+
+  // Dwarf sections base addresses.
+  if (TAI->doesDwarfRequireFrameSection()) {
+    Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
+    EmitLabel("section_debug_frame", 0);
+  }
+
+  Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
+  EmitLabel("section_info", 0);
+  Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
+  EmitLabel("section_abbrev", 0);
+  Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
+  EmitLabel("section_aranges", 0);
+
+  if (TAI->doesSupportMacInfoSection()) {
+    Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
+    EmitLabel("section_macinfo", 0);
+  }
+
+  Asm->SwitchToDataSection(TAI->getDwarfLineSection());
+  EmitLabel("section_line", 0);
+  Asm->SwitchToDataSection(TAI->getDwarfLocSection());
+  EmitLabel("section_loc", 0);
+  Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
+  EmitLabel("section_pubnames", 0);
+  Asm->SwitchToDataSection(TAI->getDwarfStrSection());
+  EmitLabel("section_str", 0);
+  Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
+  EmitLabel("section_ranges", 0);
+
+  Asm->SwitchToSection(TAI->getTextSection());
+  EmitLabel("text_begin", 0);
+  Asm->SwitchToSection(TAI->getDataSection());
+  EmitLabel("data_begin", 0);
+}
+
+/// EmitDIE - Recusively Emits a debug information entry.
+///
+void DwarfDebug::EmitDIE(DIE *Die) {
+  // Get the abbreviation for this DIE.
+  unsigned AbbrevNumber = Die->getAbbrevNumber();
+  const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
+
+  Asm->EOL();
+
+  // Emit the code (index) for the abbreviation.
+  Asm->EmitULEB128Bytes(AbbrevNumber);
+
+  if (Asm->isVerbose())
+    Asm->EOL(std::string("Abbrev [" +
+                         utostr(AbbrevNumber) +
+                         "] 0x" + utohexstr(Die->getOffset()) +
+                         ":0x" + utohexstr(Die->getSize()) + " " +
+                         dwarf::TagString(Abbrev->getTag())));
+  else
+    Asm->EOL();
+
+  SmallVector<DIEValue*, 32> &Values = Die->getValues();
+  const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
+
+  // Emit the DIE attribute values.
+  for (unsigned i = 0, N = Values.size(); i < N; ++i) {
+    unsigned Attr = AbbrevData[i].getAttribute();
+    unsigned Form = AbbrevData[i].getForm();
+    assert(Form && "Too many attributes for DIE (check abbreviation)");
+
+    switch (Attr) {
+    case dwarf::DW_AT_sibling:
+      Asm->EmitInt32(Die->SiblingOffset());
+      break;
+    case dwarf::DW_AT_abstract_origin: {
+      DIEEntry *E = cast<DIEEntry>(Values[i]);
+      DIE *Origin = E->getEntry();
+      unsigned Addr =
+        CompileUnitOffsets[Die->getAbstractCompileUnit()] +
+        Origin->getOffset();
+
+      Asm->EmitInt32(Addr);
+      break;
+    }
+    default:
+      // Emit an attribute using the defined form.
+      Values[i]->EmitValue(this, Form);
+      break;
+    }
+
+    Asm->EOL(dwarf::AttributeString(Attr));
+  }
+
+  // Emit the DIE children if any.
+  if (Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes) {
+    const std::vector<DIE *> &Children = Die->getChildren();
+
+    for (unsigned j = 0, M = Children.size(); j < M; ++j)
+      EmitDIE(Children[j]);
+
+    Asm->EmitInt8(0); Asm->EOL("End Of Children Mark");
+  }
+}
+
+/// SizeAndOffsetDie - Compute the size and offset of a DIE.
+///
+unsigned DwarfDebug::SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last) {
+  // Get the children.
+  const std::vector<DIE *> &Children = Die->getChildren();
+
+  // If not last sibling and has children then add sibling offset attribute.
+  if (!Last && !Children.empty()) Die->AddSiblingOffset();
+
+  // Record the abbreviation.
+  AssignAbbrevNumber(Die->getAbbrev());
+
+  // Get the abbreviation for this DIE.
+  unsigned AbbrevNumber = Die->getAbbrevNumber();
+  const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
+
+  // Set DIE offset
+  Die->setOffset(Offset);
+
+  // Start the size with the size of abbreviation code.
+  Offset += TargetAsmInfo::getULEB128Size(AbbrevNumber);
+
+  const SmallVector<DIEValue*, 32> &Values = Die->getValues();
+  const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
+
+  // Size the DIE attribute values.
+  for (unsigned i = 0, N = Values.size(); i < N; ++i)
+    // Size attribute value.
+    Offset += Values[i]->SizeOf(TD, AbbrevData[i].getForm());
+
+  // Size the DIE children if any.
+  if (!Children.empty()) {
+    assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
+           "Children flag not set");
+
+    for (unsigned j = 0, M = Children.size(); j < M; ++j)
+      Offset = SizeAndOffsetDie(Children[j], Offset, (j + 1) == M);
+
+    // End of children marker.
+    Offset += sizeof(int8_t);
+  }
+
+  Die->setSize(Offset - Die->getOffset());
+  return Offset;
+}
+
+/// SizeAndOffsets - Compute the size and offset of all the DIEs.
+///
+void DwarfDebug::SizeAndOffsets() {
+  // Compute size of compile unit header.
+  static unsigned Offset =
+    sizeof(int32_t) + // Length of Compilation Unit Info
+    sizeof(int16_t) + // DWARF version number
+    sizeof(int32_t) + // Offset Into Abbrev. Section
+    sizeof(int8_t);   // Pointer Size (in bytes)
+
+  // Process base compile unit.
+  if (MainCU) {
+    SizeAndOffsetDie(MainCU->getDie(), Offset, true);
+    CompileUnitOffsets[MainCU] = 0;
+    return;
+  }
+
+  // Process all compile units.
+  unsigned PrevOffset = 0;
+
+  for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i) {
+    CompileUnit *Unit = CompileUnits[i];
+    CompileUnitOffsets[Unit] = PrevOffset;
+    PrevOffset += SizeAndOffsetDie(Unit->getDie(), Offset, true)
+      + sizeof(int32_t);  // FIXME - extra pad for gdb bug.
+  }
+}
+
+/// EmitDebugInfo / EmitDebugInfoPerCU - Emit the debug info section.
+///
+void DwarfDebug::EmitDebugInfoPerCU(CompileUnit *Unit) {
+  DIE *Die = Unit->getDie();
+
+  // Emit the compile units header.
+  EmitLabel("info_begin", Unit->getID());
+
+  // Emit size of content not including length itself
+  unsigned ContentSize = Die->getSize() +
+    sizeof(int16_t) + // DWARF version number
+    sizeof(int32_t) + // Offset Into Abbrev. Section
+    sizeof(int8_t) +  // Pointer Size (in bytes)
+    sizeof(int32_t);  // FIXME - extra pad for gdb bug.
+
+  Asm->EmitInt32(ContentSize);  Asm->EOL("Length of Compilation Unit Info");
+  Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("DWARF version number");
+  EmitSectionOffset("abbrev_begin", "section_abbrev", 0, 0, true, false);
+  Asm->EOL("Offset Into Abbrev. Section");
+  Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
+
+  EmitDIE(Die);
+  // FIXME - extra padding for gdb bug.
+  Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
+  Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
+  Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
+  Asm->EmitInt8(0); Asm->EOL("Extra Pad For GDB");
+  EmitLabel("info_end", Unit->getID());
+
+  Asm->EOL();
+}
+
+void DwarfDebug::EmitDebugInfo() {
+  // Start debug info section.
+  Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
+
+  if (MainCU) {
+    EmitDebugInfoPerCU(MainCU);
+    return;
+  }
+
+  for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i)
+    EmitDebugInfoPerCU(CompileUnits[i]);
+}
+
+/// EmitAbbreviations - Emit the abbreviation section.
+///
+void DwarfDebug::EmitAbbreviations() const {
+  // Check to see if it is worth the effort.
+  if (!Abbreviations.empty()) {
+    // Start the debug abbrev section.
+    Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
+
+    EmitLabel("abbrev_begin", 0);
+
+    // For each abbrevation.
+    for (unsigned i = 0, N = Abbreviations.size(); i < N; ++i) {
+      // Get abbreviation data
+      const DIEAbbrev *Abbrev = Abbreviations[i];
+
+      // Emit the abbrevations code (base 1 index.)
+      Asm->EmitULEB128Bytes(Abbrev->getNumber());
+      Asm->EOL("Abbreviation Code");
+
+      // Emit the abbreviations data.
+      Abbrev->Emit(Asm);
+
+      Asm->EOL();
+    }
+
+    // Mark end of abbreviations.
+    Asm->EmitULEB128Bytes(0); Asm->EOL("EOM(3)");
+
+    EmitLabel("abbrev_end", 0);
+    Asm->EOL();
+  }
+}
+
+/// EmitEndOfLineMatrix - Emit the last address of the section and the end of
+/// the line matrix.
+///
+void DwarfDebug::EmitEndOfLineMatrix(unsigned SectionEnd) {
+  // Define last address of section.
+  Asm->EmitInt8(0); Asm->EOL("Extended Op");
+  Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
+  Asm->EmitInt8(dwarf::DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
+  EmitReference("section_end", SectionEnd); Asm->EOL("Section end label");
+
+  // Mark end of matrix.
+  Asm->EmitInt8(0); Asm->EOL("DW_LNE_end_sequence");
+  Asm->EmitULEB128Bytes(1); Asm->EOL();
+  Asm->EmitInt8(1); Asm->EOL();
+}
+
+/// EmitDebugLines - Emit source line information.
+///
+void DwarfDebug::EmitDebugLines() {
+  // If the target is using .loc/.file, the assembler will be emitting the
+  // .debug_line table automatically.
+  if (TAI->hasDotLocAndDotFile())
+    return;
+
+  // Minimum line delta, thus ranging from -10..(255-10).
+  const int MinLineDelta = -(dwarf::DW_LNS_fixed_advance_pc + 1);
+  // Maximum line delta, thus ranging from -10..(255-10).
+  const int MaxLineDelta = 255 + MinLineDelta;
+
+  // Start the dwarf line section.
+  Asm->SwitchToDataSection(TAI->getDwarfLineSection());
+
+  // Construct the section header.
+  EmitDifference("line_end", 0, "line_begin", 0, true);
+  Asm->EOL("Length of Source Line Info");
+  EmitLabel("line_begin", 0);
+
+  Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("DWARF version number");
+
+  EmitDifference("line_prolog_end", 0, "line_prolog_begin", 0, true);
+  Asm->EOL("Prolog Length");
+  EmitLabel("line_prolog_begin", 0);
+
+  Asm->EmitInt8(1); Asm->EOL("Minimum Instruction Length");
+
+  Asm->EmitInt8(1); Asm->EOL("Default is_stmt_start flag");
+
+  Asm->EmitInt8(MinLineDelta); Asm->EOL("Line Base Value (Special Opcodes)");
+
+  Asm->EmitInt8(MaxLineDelta); Asm->EOL("Line Range Value (Special Opcodes)");
+
+  Asm->EmitInt8(-MinLineDelta); Asm->EOL("Special Opcode Base");
+
+  // Line number standard opcode encodings argument count
+  Asm->EmitInt8(0); Asm->EOL("DW_LNS_copy arg count");
+  Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_pc arg count");
+  Asm->EmitInt8(1); Asm->EOL("DW_LNS_advance_line arg count");
+  Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_file arg count");
+  Asm->EmitInt8(1); Asm->EOL("DW_LNS_set_column arg count");
+  Asm->EmitInt8(0); Asm->EOL("DW_LNS_negate_stmt arg count");
+  Asm->EmitInt8(0); Asm->EOL("DW_LNS_set_basic_block arg count");
+  Asm->EmitInt8(0); Asm->EOL("DW_LNS_const_add_pc arg count");
+  Asm->EmitInt8(1); Asm->EOL("DW_LNS_fixed_advance_pc arg count");
+
+  // Emit directories.
+  for (unsigned DI = 1, DE = getNumSourceDirectories()+1; DI != DE; ++DI) {
+    Asm->EmitString(getSourceDirectoryName(DI));
+    Asm->EOL("Directory");
+  }
+
+  Asm->EmitInt8(0); Asm->EOL("End of directories");
+
+  // Emit files.
+  for (unsigned SI = 1, SE = getNumSourceIds()+1; SI != SE; ++SI) {
+    // Remember source id starts at 1.
+    std::pair<unsigned, unsigned> Id = getSourceDirectoryAndFileIds(SI);
+    Asm->EmitString(getSourceFileName(Id.second));
+    Asm->EOL("Source");
+    Asm->EmitULEB128Bytes(Id.first);
+    Asm->EOL("Directory #");
+    Asm->EmitULEB128Bytes(0);
+    Asm->EOL("Mod date");
+    Asm->EmitULEB128Bytes(0);
+    Asm->EOL("File size");
+  }
+
+  Asm->EmitInt8(0); Asm->EOL("End of files");
+
+  EmitLabel("line_prolog_end", 0);
+
+  // A sequence for each text section.
+  unsigned SecSrcLinesSize = SectionSourceLines.size();
+
+  for (unsigned j = 0; j < SecSrcLinesSize; ++j) {
+    // Isolate current sections line info.
+    const std::vector<SrcLineInfo> &LineInfos = SectionSourceLines[j];
+
+    if (Asm->isVerbose()) {
+      const Section* S = SectionMap[j + 1];
+      O << '\t' << TAI->getCommentString() << " Section"
+        << S->getName() << '\n';
+    } else {
+      Asm->EOL();
+    }
+
+    // Dwarf assumes we start with first line of first source file.
+    unsigned Source = 1;
+    unsigned Line = 1;
+
+    // Construct rows of the address, source, line, column matrix.
+    for (unsigned i = 0, N = LineInfos.size(); i < N; ++i) {
+      const SrcLineInfo &LineInfo = LineInfos[i];
+      unsigned LabelID = MMI->MappedLabel(LineInfo.getLabelID());
+      if (!LabelID) continue;
+
+      if (!Asm->isVerbose())
+        Asm->EOL();
+      else {
+        std::pair<unsigned, unsigned> SourceID =
+          getSourceDirectoryAndFileIds(LineInfo.getSourceID());
+        O << '\t' << TAI->getCommentString() << ' '
+          << getSourceDirectoryName(SourceID.first) << ' '
+          << getSourceFileName(SourceID.second)
+          <<" :" << utostr_32(LineInfo.getLine()) << '\n';
+      }
+
+      // Define the line address.
+      Asm->EmitInt8(0); Asm->EOL("Extended Op");
+      Asm->EmitInt8(TD->getPointerSize() + 1); Asm->EOL("Op size");
+      Asm->EmitInt8(dwarf::DW_LNE_set_address); Asm->EOL("DW_LNE_set_address");
+      EmitReference("label",  LabelID); Asm->EOL("Location label");
+
+      // If change of source, then switch to the new source.
+      if (Source != LineInfo.getSourceID()) {
+        Source = LineInfo.getSourceID();
+        Asm->EmitInt8(dwarf::DW_LNS_set_file); Asm->EOL("DW_LNS_set_file");
+        Asm->EmitULEB128Bytes(Source); Asm->EOL("New Source");
+      }
+
+      // If change of line.
+      if (Line != LineInfo.getLine()) {
+        // Determine offset.
+        int Offset = LineInfo.getLine() - Line;
+        int Delta = Offset - MinLineDelta;
+
+        // Update line.
+        Line = LineInfo.getLine();
+
+        // If delta is small enough and in range...
+        if (Delta >= 0 && Delta < (MaxLineDelta - 1)) {
+          // ... then use fast opcode.
+          Asm->EmitInt8(Delta - MinLineDelta); Asm->EOL("Line Delta");
+        } else {
+          // ... otherwise use long hand.
+          Asm->EmitInt8(dwarf::DW_LNS_advance_line);
+          Asm->EOL("DW_LNS_advance_line");
+          Asm->EmitSLEB128Bytes(Offset); Asm->EOL("Line Offset");
+          Asm->EmitInt8(dwarf::DW_LNS_copy); Asm->EOL("DW_LNS_copy");
+        }
+      } else {
+        // Copy the previous row (different address or source)
+        Asm->EmitInt8(dwarf::DW_LNS_copy); Asm->EOL("DW_LNS_copy");
+      }
+    }
+
+    EmitEndOfLineMatrix(j + 1);
+  }
+
+  if (SecSrcLinesSize == 0)
+    // Because we're emitting a debug_line section, we still need a line
+    // table. The linker and friends expect it to exist. If there's nothing to
+    // put into it, emit an empty table.
+    EmitEndOfLineMatrix(1);
+
+  EmitLabel("line_end", 0);
+  Asm->EOL();
+}
+
+/// EmitCommonDebugFrame - Emit common frame info into a debug frame section.
+///
+void DwarfDebug::EmitCommonDebugFrame() {
+  if (!TAI->doesDwarfRequireFrameSection())
+    return;
+
+  int stackGrowth =
+    Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
+      TargetFrameInfo::StackGrowsUp ?
+    TD->getPointerSize() : -TD->getPointerSize();
+
+  // Start the dwarf frame section.
+  Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
+
+  EmitLabel("debug_frame_common", 0);
+  EmitDifference("debug_frame_common_end", 0,
+                 "debug_frame_common_begin", 0, true);
+  Asm->EOL("Length of Common Information Entry");
+
+  EmitLabel("debug_frame_common_begin", 0);
+  Asm->EmitInt32((int)dwarf::DW_CIE_ID);
+  Asm->EOL("CIE Identifier Tag");
+  Asm->EmitInt8(dwarf::DW_CIE_VERSION);
+  Asm->EOL("CIE Version");
+  Asm->EmitString("");
+  Asm->EOL("CIE Augmentation");
+  Asm->EmitULEB128Bytes(1);
+  Asm->EOL("CIE Code Alignment Factor");
+  Asm->EmitSLEB128Bytes(stackGrowth);
+  Asm->EOL("CIE Data Alignment Factor");
+  Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), false));
+  Asm->EOL("CIE RA Column");
+
+  std::vector<MachineMove> Moves;
+  RI->getInitialFrameState(Moves);
+
+  EmitFrameMoves(NULL, 0, Moves, false);
+
+  Asm->EmitAlignment(2, 0, 0, false);
+  EmitLabel("debug_frame_common_end", 0);
+
+  Asm->EOL();
+}
+
+/// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
+/// section.
+void
+DwarfDebug::EmitFunctionDebugFrame(const FunctionDebugFrameInfo&DebugFrameInfo){
+  if (!TAI->doesDwarfRequireFrameSection())
+    return;
+
+  // Start the dwarf frame section.
+  Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
+
+  EmitDifference("debug_frame_end", DebugFrameInfo.Number,
+                 "debug_frame_begin", DebugFrameInfo.Number, true);
+  Asm->EOL("Length of Frame Information Entry");
+
+  EmitLabel("debug_frame_begin", DebugFrameInfo.Number);
+
+  EmitSectionOffset("debug_frame_common", "section_debug_frame",
+                    0, 0, true, false);
+  Asm->EOL("FDE CIE offset");
+
+  EmitReference("func_begin", DebugFrameInfo.Number);
+  Asm->EOL("FDE initial location");
+  EmitDifference("func_end", DebugFrameInfo.Number,
+                 "func_begin", DebugFrameInfo.Number);
+  Asm->EOL("FDE address range");
+
+  EmitFrameMoves("func_begin", DebugFrameInfo.Number, DebugFrameInfo.Moves,
+                 false);
+
+  Asm->EmitAlignment(2, 0, 0, false);
+  EmitLabel("debug_frame_end", DebugFrameInfo.Number);
+
+  Asm->EOL();
+}
+
+void DwarfDebug::EmitDebugPubNamesPerCU(CompileUnit *Unit) {
+  EmitDifference("pubnames_end", Unit->getID(),
+                 "pubnames_begin", Unit->getID(), true);
+  Asm->EOL("Length of Public Names Info");
+
+  EmitLabel("pubnames_begin", Unit->getID());
+
+  Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("DWARF Version");
+
+  EmitSectionOffset("info_begin", "section_info",
+                    Unit->getID(), 0, true, false);
+  Asm->EOL("Offset of Compilation Unit Info");
+
+  EmitDifference("info_end", Unit->getID(), "info_begin", Unit->getID(),
+                 true);
+  Asm->EOL("Compilation Unit Length");
+
+  StringMap<DIE*> &Globals = Unit->getGlobals();
+  for (StringMap<DIE*>::const_iterator
+         GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
+    const char *Name = GI->getKeyData();
+    DIE * Entity = GI->second;
+
+    Asm->EmitInt32(Entity->getOffset()); Asm->EOL("DIE offset");
+    Asm->EmitString(Name, strlen(Name)); Asm->EOL("External Name");
+  }
+
+  Asm->EmitInt32(0); Asm->EOL("End Mark");
+  EmitLabel("pubnames_end", Unit->getID());
+
+  Asm->EOL();
+}
+
+/// EmitDebugPubNames - Emit visible names into a debug pubnames section.
+///
+void DwarfDebug::EmitDebugPubNames() {
+  // Start the dwarf pubnames section.
+  Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection());
+
+  if (MainCU) {
+    EmitDebugPubNamesPerCU(MainCU);
+    return;
+  }
+
+  for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i)
+    EmitDebugPubNamesPerCU(CompileUnits[i]);
+}
+
+/// EmitDebugStr - Emit visible names into a debug str section.
+///
+void DwarfDebug::EmitDebugStr() {
+  // Check to see if it is worth the effort.
+  if (!StringPool.empty()) {
+    // Start the dwarf str section.
+    Asm->SwitchToDataSection(TAI->getDwarfStrSection());
+
+    // For each of strings in the string pool.
+    for (unsigned StringID = 1, N = StringPool.size();
+         StringID <= N; ++StringID) {
+      // Emit a label for reference from debug information entries.
+      EmitLabel("string", StringID);
+
+      // Emit the string itself.
+      const std::string &String = StringPool[StringID];
+      Asm->EmitString(String); Asm->EOL();
+    }
+
+    Asm->EOL();
+  }
+}
+
+/// EmitDebugLoc - Emit visible names into a debug loc section.
+///
+void DwarfDebug::EmitDebugLoc() {
+  // Start the dwarf loc section.
+  Asm->SwitchToDataSection(TAI->getDwarfLocSection());
+  Asm->EOL();
+}
+
+/// EmitDebugARanges - Emit visible names into a debug aranges section.
+///
+void DwarfDebug::EmitDebugARanges() {
+  // Start the dwarf aranges section.
+  Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
+
+  // FIXME - Mock up
+#if 0
+  CompileUnit *Unit = GetBaseCompileUnit();
+
+  // Don't include size of length
+  Asm->EmitInt32(0x1c); Asm->EOL("Length of Address Ranges Info");
+
+  Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("Dwarf Version");
+
+  EmitReference("info_begin", Unit->getID());
+  Asm->EOL("Offset of Compilation Unit Info");
+
+  Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Size of Address");
+
+  Asm->EmitInt8(0); Asm->EOL("Size of Segment Descriptor");
+
+  Asm->EmitInt16(0);  Asm->EOL("Pad (1)");
+  Asm->EmitInt16(0);  Asm->EOL("Pad (2)");
+
+  // Range 1
+  EmitReference("text_begin", 0); Asm->EOL("Address");
+  EmitDifference("text_end", 0, "text_begin", 0, true); Asm->EOL("Length");
+
+  Asm->EmitInt32(0); Asm->EOL("EOM (1)");
+  Asm->EmitInt32(0); Asm->EOL("EOM (2)");
+#endif
+
+  Asm->EOL();
+}
+
+/// EmitDebugRanges - Emit visible names into a debug ranges section.
+///
+void DwarfDebug::EmitDebugRanges() {
+  // Start the dwarf ranges section.
+  Asm->SwitchToDataSection(TAI->getDwarfRangesSection());
+  Asm->EOL();
+}
+
+/// EmitDebugMacInfo - Emit visible names into a debug macinfo section.
+///
+void DwarfDebug::EmitDebugMacInfo() {
+  if (TAI->doesSupportMacInfoSection()) {
+    // Start the dwarf macinfo section.
+    Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
+    Asm->EOL();
+  }
+}
+
+/// EmitDebugInlineInfo - Emit inline info using following format.
+/// Section Header:
+/// 1. length of section
+/// 2. Dwarf version number
+/// 3. address size.
+///
+/// Entries (one "entry" for each function that was inlined):
+///
+/// 1. offset into __debug_str section for MIPS linkage name, if exists;
+///   otherwise offset into __debug_str for regular function name.
+/// 2. offset into __debug_str section for regular function name.
+/// 3. an unsigned LEB128 number indicating the number of distinct inlining
+/// instances for the function.
+///
+/// The rest of the entry consists of a {die_offset, low_pc} pair for each
+/// inlined instance; the die_offset points to the inlined_subroutine die in the
+/// __debug_info section, and the low_pc is the starting address for the
+/// inlining instance.
+void DwarfDebug::EmitDebugInlineInfo() {
+  if (!TAI->doesDwarfUsesInlineInfoSection())
+    return;
+
+  if (!MainCU)
+    return;
+
+  Asm->SwitchToDataSection(TAI->getDwarfDebugInlineSection());
+  Asm->EOL();
+  EmitDifference("debug_inlined_end", 1,
+                 "debug_inlined_begin", 1, true);
+  Asm->EOL("Length of Debug Inlined Information Entry");
+
+  EmitLabel("debug_inlined_begin", 1);
+
+  Asm->EmitInt16(dwarf::DWARF_VERSION); Asm->EOL("Dwarf Version");
+  Asm->EmitInt8(TD->getPointerSize()); Asm->EOL("Address Size (in bytes)");
+
+  for (DenseMap<GlobalVariable *, SmallVector<unsigned, 4> >::iterator
+         I = InlineInfo.begin(), E = InlineInfo.end(); I != E; ++I) {
+    GlobalVariable *GV = I->first;
+    SmallVector<unsigned, 4> &Labels = I->second;
+    DISubprogram SP(GV);
+    std::string Name;
+    std::string LName;
+
+    SP.getLinkageName(LName);
+    SP.getName(Name);
+
+    Asm->EmitString(LName.empty() ? Name : LName);
+    Asm->EOL("MIPS linkage name");
+
+    Asm->EmitString(Name); Asm->EOL("Function name");
+
+    Asm->EmitULEB128Bytes(Labels.size()); Asm->EOL("Inline count");
+
+    for (SmallVector<unsigned, 4>::iterator LI = Labels.begin(),
+           LE = Labels.end(); LI != LE; ++LI) {
+      DIE *SP = MainCU->getDieMapSlotFor(GV);
+      Asm->EmitInt32(SP->getOffset()); Asm->EOL("DIE offset");
+
+      if (TD->getPointerSize() == sizeof(int32_t))
+        O << TAI->getData32bitsDirective();
+      else
+        O << TAI->getData64bitsDirective();
+
+      PrintLabelName("label", *LI); Asm->EOL("low_pc");
+    }
+  }
+
+  EmitLabel("debug_inlined_end", 1);
+  Asm->EOL();
+}
+
 /// GetOrCreateSourceID - Look up the source id with the given directory and
 /// source file names. If none currently exists, create a new id and insert it
 /// in the SourceIds map. This can update DirectoryNames and SourceFileNames
@@ -1564,7 +2307,7 @@ void DwarfDebug::EndFunction(MachineFunction *MF) {
   for (SmallVector<DbgScope *, 32>::iterator
          I = AbstractInstanceRootList.begin(),
          E = AbstractInstanceRootList.end(); I != E; ++I)
-    ConstructFunctionDbgScope(*I, true);
+    ConstructAbstractDbgScope(*I);
 
   // Construct scopes for subprogram.
   if (FunctionDbgScope)
@@ -1753,7 +2496,7 @@ void DwarfDebug::RecordVariable(GlobalVariable *GV, unsigned FrameIndex,
     DebugTimer->stopTimer();
 }
 
-/// RecordInlinedFnStart - Indicate the start of inlined subroutine.
+//// RecordInlinedFnStart - Indicate the start of inlined subroutine.
 unsigned DwarfDebug::RecordInlinedFnStart(DISubprogram &SP, DICompileUnit CU,
                                           unsigned Line, unsigned Col) {
   unsigned LabelID = MMI->NextLabelID();
@@ -1811,7 +2554,6 @@ unsigned DwarfDebug::RecordInlinedFnStart(DISubprogram &SP, DICompileUnit CU,
   MMI->RecordUsedDbgLabel(LabelID);
 
   LexicalScopeStack.back()->AddConcreteInst(ConcreteScope);
-  LexicalScopeStack.push_back(ConcreteScope);
 
   // Keep track of the concrete scope that's inlined into this function.
   DenseMap<GlobalVariable *, SmallVector<DbgScope *, 8> >::iterator
@@ -1863,7 +2605,6 @@ unsigned DwarfDebug::RecordInlinedFnEnd(DISubprogram &SP) {
   unsigned ID = MMI->NextLabelID();
   MMI->RecordUsedDbgLabel(ID);
   Scope->setEndLabelID(ID);
-  LexicalScopeStack.pop_back();
 
   if (TimePassesIsEnabled)
     DebugTimer->stopTimer();
@@ -1897,727 +2638,3 @@ void DwarfDebug::RecordVariableScope(DIVariable &DV,
   if (TimePassesIsEnabled)
     DebugTimer->stopTimer();
 }
-
-//===----------------------------------------------------------------------===//
-// Emit Methods
-//===----------------------------------------------------------------------===//
-
-/// SizeAndOffsetDie - Compute the size and offset of a DIE.
-///
-unsigned DwarfDebug::SizeAndOffsetDie(DIE *Die, unsigned Offset, bool Last) {
-  // Get the children.
-  const std::vector<DIE *> &Children = Die->getChildren();
-
-  // If not last sibling and has children then add sibling offset attribute.
-  if (!Last && !Children.empty()) Die->AddSiblingOffset();
-
-  // Record the abbreviation.
-  AssignAbbrevNumber(Die->getAbbrev());
-
-  // Get the abbreviation for this DIE.
-  unsigned AbbrevNumber = Die->getAbbrevNumber();
-  const DIEAbbrev *Abbrev = Abbreviations[AbbrevNumber - 1];
-
-  // Set DIE offset
-  Die->setOffset(Offset);
-
-  // Start the size with the size of abbreviation code.
-  Offset += TargetAsmInfo::getULEB128Size(AbbrevNumber);
-
-  const SmallVector<DIEValue*, 32> &Values = Die->getValues();
-  const SmallVector<DIEAbbrevData, 8> &AbbrevData = Abbrev->getData();
-
-  // Size the DIE attribute values.
-  for (unsigned i = 0, N = Values.size(); i < N; ++i)
-    // Size attribute value.
-    Offset += Values[i]->SizeOf(TD, AbbrevData[i].getForm());
-
-  // Size the DIE children if any.
-  if (!Children.empty()) {
-    assert(Abbrev->getChildrenFlag() == dwarf::DW_CHILDREN_yes &&
-           "Children flag not set");
-
-    for (unsigned j = 0, M = Children.size(); j < M; ++j)
-      Offset = SizeAndOffsetDie(Children[j], Offset, (j + 1) == M);
-
-    // End of children marker.
-    Offset += sizeof(int8_t);
-  }
-
-  Die->setSize(Offset - Die->getOffset());
-  return Offset;
-}
-
-/// SizeAndOffsets - Compute the size and offset of all the DIEs.
-///
-void DwarfDebug::SizeAndOffsets() {
-  // Compute size of compile unit header.
-  static unsigned Offset =
-    sizeof(int32_t) + // Length of Compilation Unit Info
-    sizeof(int16_t) + // DWARF version number
-    sizeof(int32_t) + // Offset Into Abbrev. Section
-    sizeof(int8_t);   // Pointer Size (in bytes)
-
-  // Process base compile unit.
-  if (MainCU) {
-    SizeAndOffsetDie(MainCU->getDie(), Offset, true);
-    CompileUnitOffsets[MainCU] = 0;
-    return;
-  }
-
-  // Process all compile units.
-  unsigned PrevOffset = 0;
-
-  for (unsigned i = 0, e = CompileUnits.size(); i != e; ++i) {
-    CompileUnit *Unit = CompileUnits[i];
-    CompileUnitOffsets[Unit] = PrevOffset;
-    PrevOffset += SizeAndOffsetDie(Unit->getDie(), Offset, true)
-      + sizeof(int32_t);  // FIXME - extra pad for gdb bug.
-  }
-}
-
-/// EmitInitial - Emit initial Dwarf declarations.  This is necessary for cc
-/// tools to recognize the object file contains Dwarf information.
-void DwarfDebug::EmitInitial() {
-  // Check to see if we already emitted intial headers.
-  if (didInitial) return;
-  didInitial = true;
-
-  // Dwarf sections base addresses.
-  if (TAI->doesDwarfRequireFrameSection()) {
-    Asm->SwitchToDataSection(TAI->getDwarfFrameSection());
-    EmitLabel("section_debug_frame", 0);
-  }
-
-  Asm->SwitchToDataSection(TAI->getDwarfInfoSection());
-  EmitLabel("section_info", 0);
-  Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection());
-  EmitLabel("section_abbrev", 0);
-  Asm->SwitchToDataSection(TAI->getDwarfARangesSection());
-  EmitLabel("section_aranges", 0);
-
-  if (TAI->doesSupportMacInfoSection()) {
-    Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection());
-    EmitLabel("section_macinfo", 0);
-  }
-
-  Asm->SwitchToDataSection(TAI->getDwarfLineSection());
-  EmitLabel("section_line", 0);
-  Asm->SwitchToDataSection(TAI->getDwarfLocSection());
-  EmitLabel("section_loc", 0);
-  Asm->SwitchToDataSection(TAI-